 Around 1290, he launched the Pamalayu expedition to Sumatra, in order to conquer Jambi in the south, one of successor states to Srivijaya.Jambi was one of the first Indonesian polities where Islam had established its presence, and it already entertained cordial relationships with Yuan China.Kublai Khan ordered that a strong punitive naval expedition be launched against the remote equatorial islands in order to punish Kertanegara in 1292.